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natita [175]
3 years ago
7

Which of these statements best explains how fossil records provide evidence to the scientific theory of evolution?

Chemistry
1 answer:
Lorico [155]3 years ago
6 0

your answer would be C

hope i helped

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Copper has two naturally occurring isotopes. Cu−63 has a mass of 62.939 amu and relative abundance of 69.17%.
fiasKO [112]
The answer is 64.907 amu.

The atomic mass of an element is the average of the atomic masses of its isotopes. The relative abundance of isotopes must be taken into consideration, therefore:
atomic mass of copper = atomic mass of isotope 1 * abundance 1 + atomic mass of isotope 2 * abundance 2

We know:
atomic mass of copper = 63.546 amu
The atomic mass of isotope 1 is: 62.939 amu
The abundance of isotope 1 is: 69.17% = 0.6917
The atomic mass of isotope 1 is: x
The abundance of isotope 2: 100% - 69.17% = 30.83% = 0.3083

Thus:
63.546 amu = 62.939 amu * 0.6917 + x * 0.3083
63.546 <span>amu = 43.535 amu + 0.3083x
</span>⇒ 63.546 amu - 43.535 amu = 0.3083x
⇒ 20.011 amu = 0.3083x
   ⇒ x = 20.011 amu ÷ 0.3083 = 64.907 amu
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MaRussiya [10]
Hello my friend thank you
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What is the difference between weather and climate? Why is it so hot along the equator? Why are some areas of the ocean warmer t
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Which three elements are combined in lithium sulfate ?
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Substances which will glow in the dark after being exposed to sunlight are called:
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It  is called phosphorescent substances. 
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